551221251 has 16 divisors (see below), whose sum is σ = 842504448. Its totient is φ = 314028000.

The previous prime is 551221219. The next prime is 551221271. The reversal of 551221251 is 152122155.

It is not a de Polignac number, because 551221251 - 2⁵ = 551221219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32700 + ... + 46601.

It is an arithmetic number, because the mean of its divisors is an integer number (52656528).

Almost surely, 2^551221251 is an apocalyptic number.

551221251 is a deficient number, since it is larger than the sum of its proper divisors (291283197).

551221251 is a wasteful number, since it uses less digits than its factorization.

551221251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79642.

The product of its digits is 1000, while the sum is 24.

The square root of 551221251 is about 23478.1015203530. The cubic root of 551221251 is about 819.9272446851.

The spelling of 551221251 in words is "five hundred fifty-one million, two hundred twenty-one thousand, two hundred fifty-one".